Improvement in turning-chisel



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REUBEN P. BUTTLES AND SALMON SWEET, OF MANSFIELD, PENNSYL- VA NIA.

Letters Patent No. 101,981, dated April 19, 1870.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern l Be it known that we, REUBEN P. BUTTLEs and SALMON SWEET, of Mansfield, in the county of Tioga and State of Pennsylvania, have invented anew and improved Turning-Chisel; and we do hereby declare that the following is a full andv exact description thereof', reference being had to the accompanying drawings and to the let-ters O reference marke( thereon making a part of this specification.

This invention is designed to cover a want long known to exist, that is, to construct a turning-chisel in such manner as will enable the person using it to adjust it to the desired diameter -that is sought, and then accurately and without deviation turn the wood down to the necessary size.

The tool is particularly useful in turning tenons, for the instrument heilig once set to the size of the hole or mortise, the tenen may at once be turned down to the required size with accuracy and without the aid of a gauge.

In the accompanying sheet of drawings- Figure 1 represents a plan or top view of our chisel, and

Figure 2, a side view of the same.

Similar letters of reference indicate corresponding parts in the several drawings. i

A is a chisel, which may be of any required length and width, with a square cutting edge on one end for the purpose of reducing the tenon to nearly the size required, and a tang at the other, onto which is fitted Athe handle C.

To this chisel are. fitted, with countersunk heads, the screws a audb, so that they may freely turn.

B is a supplementary chisel, shorter in length than the first-named chisel A, tapering slightly from point to heel.

The outer end of this supplementary chisel is brought to a point and cutting edge by theangular -faces'c c.

- which passes the set-screw a, and through the slot f the screw b passes and holds thelchisel iu posi-tion by the uut a'.

the chisel is elevated or depressed it will yield more or less andyet at the same time firmly support the chisel B in position. p

The chisel B is made slightly wider than the chisel A, so that it will make a smooth track for the chisel A to ride on, and thus facilitate the accurate turning of the tenon; and, to prevent any tendency on the part of the chisel B from dipping, the extreme point is curved slightly upward; and if, in turning, it should 'become necessary to advance the point of the supplementary chisel B nearer to 'the point of the chisel A, it may by readily accomplished by loosening the nut i and pushing the chisel outward.

In order to use our chisel it is simply necessary to reduce the tenon to nearly the' required size with the edge of the chisel A, then byplacing the teuon beltween said chisel and the point of the'supplemeutary chisel B the tenon is turned down toadiameter equal to the space or width between the two chisels, which insures a uniform diameter to the tenon and obviates the necessity of using a gauge to determine when the required size is obtaine Having thus described our invention,

What we claim as new, and desire to secure by Letters Patent, is-

The herein-described arrangement of the chisels A B, the screws a and b, .and elastic cushion h, all constructed and operating substantially as set forth.

R. P. BUTTLES. SALMON SWEET.

1Vitnesses z S. S. GIL'LETT, A. K. INGALS. 

